js custom methods

Question 1

What is a method?

Answer 1

a function which is a property of an object

Question 2

How can you tell the difference between a method definition and a method call?

Answer 2

method definition: function code block assigned to a property

method call: object.method()

Question 3

Describe method definition syntax (structure).

Answer 3

property: function () {}

Question 4

Describe method call syntax (structure).

Answer 4

object.property();

i. e.,
calculator. square()

Question 5

How is a method different from any other function?

Answer 5

functions are defined outside of classes, while methods are defined inside of and part of classes

Question 6

What is the defining characteristic of Object-Oriented Programming?

Answer 6

data is encapsulated within objects and the object itself is operated on, rather than its component parts

Question 7

What are the four “principles” of Object-Oriented Programming?

Answer 7

abstraction, encapsulation, inheritance, polymorphism

Question 8

What is “abstraction”?

Answer 8

a way to reduce complexity and allow efficient design and implementation in complex software systems; it hides the technical complexity of systems behind simpler APIs

• helps the user to avoid writing low level code
• avoids code duplication and increases reusability
• can change internal implementation of class independently without affecting the user
• helps to increase security of an application or program as only important details are provided to the user

Question 9

What does API stand for?

Answer 9

application programming interface

Question 10

What is the purpose of an API?

Answer 10

abstraction

a set of features and rules that exist inside a software program (the application) enabling interaction with it through software - as opposed to a human user interface

a set of code features (e.g. methods, properties, events, and URLs) that a developer can use in their apps for interacting with components of a user’s web browser, or other software/hardware on the user’s computer, or third party websites and services